Units (Forces and Motion)
2 marks · Exam LevelA laboratory experiment measures a force of 6 newtons acting on a mass of 2 kilograms. State the SI unit (name and symbol) that should be used for expressing the ratio of force to mass, and write its value for this experiment.
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The SI unit for force per unit mass is newton per kilogram (N/kg). The value is 3 N/kg.
Also accept: newton/kilogram (N/kg); value 3 N/kg
Common mistakes: Writing newton metre (Nm) or newton (N) as unit; Calculating value without correct unit
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States the correct SI unit (name and symbol) for force per unit mass (newton per kilogram, N/kg)
A1 · 1 mark · Correctly calculates and states the value: 3 N/kg
Worked solution
The ratio of force to mass is called gravitational field strength, and its SI unit is newton per kilogram (N/kg).